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If the phone is unlocked, it can be used on T-Mobile, but it cannot be used at the same time on Verizon. It will be one or the other.

I am just trying to understand this... If the phone is unlocked and it is activated on the Verizon, when I put my T-mobile sim in the slot, it will be a t-mobile phone but when I take the card out, it will be a Verizon phone?

Verizon doesn't lock the Ozone to Verizon?
My uncle bought one of those Verizon "world phones", not the Ozone, but a Samsung "dumb" world phone.
We then tried to get it working with a non-Verizon SIM... NOPE... Verizon refused to unlock it for other carrier SIMs.

That the Ozone is a HTC certainly would help as there probably are hacks out there to unlock it. But I definitely got the sense that Verizon generally did not willingly unlock its world phones for other GSM SIMs, even int'l SIMs, nevermind domestic ones like Tmo USA...

I am just trying to understand this... If the phone is unlocked and it is activated on the Verizon, when I put my T-mobile sim in the slot, it will be a t-mobile phone but when I take the card out, it will be a Verizon phone?

Once you unlock it, you can let it automatically select a CDMA OR GSM network or you can do it manually.

I have a T-M SIM and also run on VZ resellers, but only one at a time.

To get VZW to generate an unlock code for the Ozone, you need to contact the global support desk & request it. There's info on this forum and also at www.everythingwm.com about the requirements & steps to take, etc.

A prepaid SIM (AT&T Gophone) will work for voice service when you switch it to GSM mode - not sure about data services, plus you will need to have a data plan on your prepaid account anyway. A T-Mo prepaid SIM also work for voice calls but data services will most likely not worked (as I tried it on my unlocked Q8 GSM global phone & web surfing was disabled/blocked by T-Mo (it apparently checked the database & recognized mine as a smartphone).

For me, the ability to switch to a GSM SIM even domestically when not traveling is important in case I lose connectivity to the CDMA towers for whatever reasons - as I do not have to always carry 2 phones with the GSM used mainly for backup voice calls.

P.S. I downloaded the official WM6.5 ROM update (from 1.12.605.30 in WM6.1 to 2.16.605.15) and it's cool - the customized HTC Home Screen feature is nice, along with a few other "edits" to move the screen lock, full screen mobile web browser mode, etc.